Nitride coating enhances endothelialization on biomedical NiTi shape memory alloy

Area of Science:

• Biomaterials Science
• Materials Engineering
• Medical Device Technology

Background:

• Nitinol (NiTi) shape memory alloys are widely used in implantable devices, particularly vascular stents.
• Improving the biocompatibility of NiTi is crucial for enhancing stent performance and patient outcomes.
• Endothelialization is a key factor in the successful integration of vascular stents.

Purpose of the Study:

• To investigate the effects of surface nitriding on the biocompatibility of NiTi shape memory alloy for vascular stent applications.
• To evaluate the impact of gas nitriding on endothelial cell behavior on NiTi surfaces.
• To explore the potential of nitride coatings for improving stent endothelialization.

Main Methods:

• Surface gas nitriding treatment was applied to NiTi shape memory alloy samples.
• Human umbilical vein endothelial cells (HUVECs) were cultured on both untreated and nitrided NiTi surfaces.
• Cell adhesion, spreading, and proliferation assays were performed to assess biocompatibility.

Main Results:

• Gas nitriding significantly enhanced the adhesion of HUVECs to the NiTi surface compared to untreated NiTi.
• Improved cell spreading and proliferation were observed on the nitrided NiTi surfaces.
• The results indicate a positive effect of nitride coating on endothelial cell response.

Conclusions:

• Surface gas nitriding is an effective method for enhancing the biocompatibility of NiTi vascular stents.
• Nitrided NiTi surfaces promote superior endothelial cell interactions, crucial for successful stent implantation.
• This study demonstrates the potential of nitride coatings to accelerate endothelialization on NiTi stents.